I just got back from a trip in China, Kyrgyzstan, Uzbekistan (in car) & Iran as well as Pakistan on bike. In 2012 I was in West Africa. Here is a link to my blog with some practical info about the border crossing (very important in China & Kyrgyzstan specially), fuel, visa, etc in these countries.
You can also see some posts as well as pictures and videos on the blog. Hope you find it useful.